Journal
ADVANCED MATERIALS
Volume 34, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106073
Keywords
2D polymers; coloration efficiency; electrochromic devices; smart windows
Categories
Funding
- EU Graphene Flagship [881603]
- ERC [852909]
- ERC Consolidator Grant (T2DCP)
- Coordination Networks: Building Blocks for Functional Systems
- H2020-MSCA-ITN (ULTIMATE) [813036]
- H2020-FETOPEN (PROGENY) [899205]
- CRC (Chemistry of Synthetic Two-Dimensional Materials) [417590517]
- German Science Council and Center of Advancing Electronics Dresden (cfaed)
- Taishan Scholars Program of Shandong Province [tsqn201909047]
- China Scholarship Council
- Projekt DEAL
- European Research Council (ERC) [852909] Funding Source: European Research Council (ERC)
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The high-performance ECDs with a fully crystalline viologen-immobilized 2D polymer thin film demonstrate rapid switching speed, high coloration efficiency, and low energy consumption. By vertically integrating the V2DP ECDs with transparent solar cells, transmission-tunable, self-sustainable EC window prototypes were successfully fabricated.
Electrochromic devices (ECDs) have emerged as a unique class of optoelectronic devices for the development of smart windows. However, current ECDs typically suffer from low coloration efficiency (CE) and high energy consumption, which have thus hindered their practical applications, especially as components in solar-powered EC windows. Here, the high-performance ECDs with a fully crystalline viologen-immobilized 2D polymer (V2DP) thin film as the color-switching layer is demonstrated. The high density of vertically oriented pore channels (pore size approximate to 4.5 nm; pore density approximate to 5.8 x 10(16) m(-2)) in the synthetic V2DP film enables high utilization of redox-active viologen moieties and benefits for Li+ ion diffusion/transport. As a result, the as-fabricated ECDs achieve a rapid switching speed (coloration, 2.8 s; bleaching, 1.2 s), and a high CE (989 cm(2) C-1), and low energy consumption (21.1 mu W cm(-2)). Moreover, it is managed to fabricate transmission-tunable, self-sustainable EC window prototypes by vertically integrating the V2DP ECDs with transparent solar cells. This work sheds light on designing electroactive 2D polymers with molecular precision for optoelectronics and paves a practical route toward developing self-powered EC windows to offset the electricity consumption of buildings.
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